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getting ready for auto resample in opposing versions of SLIN codec

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git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@232 d0543943-73ff-0310-b7d9-9358b9ac24b2
This commit is contained in:
Anthony Minessale
2005-12-29 00:26:17 +00:00
parent 99e7acce6b
commit 82d141df73
3 changed files with 139 additions and 6 deletions
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68
src/switch_utils.c
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@@ -30,6 +30,74 @@
*
*/
#include <switch_utils.h>
#define NORMFACT (float)0x8000
#define MAXSAMPLE (float)0x7FFF
#define MAXSAMPLEC (char)0x7F
SWITCH_DECLARE(int) float_to_short(float *f, short *s, int len)
{
int i;
float ft;
for(i=0;i<len;i++) {
ft = f[i] * NORMFACT;
if(ft >= 0) {
s[i] = (short)(ft+0.5);
} else {
s[i] = (short)(ft-0.5);
}
if (s[i] > (short)MAXSAMPLE) s[i] = (short)MAXSAMPLE;
if (s[i] < (short)-MAXSAMPLE) s[i] = (short)-MAXSAMPLE;
}
return len;
}
SWITCH_DECLARE(int) char_to_float(char *c, float *f, int len)
{
int i;
if (len % 2) {
return(-1);
}
for(i=1;i<len;i+=2) {
f[(int)(i/2)] = (float)(((c[i])*0x100) + c[i-1]);
f[(int)(i/2)] /= NORMFACT;
if (f[(int)(i/2)] > MAXSAMPLE) f[(int)(i/2)] = MAXSAMPLE;
if (f[(int)(i/2)] < -MAXSAMPLE) f[(int)(i/2)] = -MAXSAMPLE;
}
return len/2;
}
SWITCH_DECLARE(int) float_to_char(float *f, char *c, int len)
{
int i;
float ft;
long l;
for(i=0;i<len;i++) {
ft = f[i] * NORMFACT;
if (ft >= 0) {
l = (long)(ft+0.5);
} else {
l = (long)(ft-0.5);
}
c[i*2] = (unsigned char)((l)&0xff);
c[i*2+1] = (unsigned char)(((l)>>8)&0xff);
}
return len*2;
}
SWITCH_DECLARE(int) short_to_float(short *s, float *f, int len)
{
int i;
int min, max;
min = max = 0;
for(i=0;i<len;i++) {
f[i] = (float)(s[i]) / NORMFACT;
}
return len;
}
SWITCH_DECLARE(char *) switch_cut_path(char *in)
{